滨海地区干线公路桥梁桩柱防腐措施研究
发布时间：2019-06-15 18:39
【摘要】：本文针对滨海地区钢筋混凝土桥梁墩柱受海水腐蚀和桩头自身施工缺陷原因,出现的混凝土失效劣化、桩头混凝土脱落和桩基钢筋外露锈蚀,以至于给桥梁结构带来的耐久性问题,以山东省省道S315线富国大桥危桥改造工程为背景,开展滨州普通国省干线公路桥梁桩柱防腐措施的研究。主要研究内容包括：1、滨海地区公路钢筋混凝土桥梁较普遍的存在由于受空气、水和土壤中Cl-、SO42离子侵蚀,混凝土过早的出现失效劣化的问题。通过对钢筋混凝土桥梁的劣化原因和机理进行系统分析研究；在分析各种混凝土原材料、减水剂和活性掺和料等的结构组成的基础上,优选混凝土原材料,严格控制水胶比,掺加高效减水剂,以及添加活性掺和料超细粉,对富国大桥加宽新桥墩柱混凝土配合进行详细的耐久性设计,提高混凝土的密实性,以期达到延长混凝土使用寿命的目的；2、从近年来通过大量的滨海桥梁研究结果发现,滨海及海洋环境中,浪溅区及水位变动区,因受海浪的飞溅和冲刷,表面常处潮湿状态,混凝土所处环境恶劣,更容易发生腐蚀。由于混凝土本身的特点,其不可能完全避免的出现表面的微小孔隙和因收缩除变、甚至受力而产生的裂缝等情况,这给混凝土的耐久性能带来了隐患。单纯一种防护措施已很难保证混凝土结构在腐蚀环境中的耐久性。通过分析常用混凝土防腐涂层的材料组成并比较其优缺点,结合防腐使用寿命,提出采用环氧封闭底漆+环氧中间漆+丙烯酸聚氨酯面漆防腐体系的设计组合,设计出适合富国大桥的混凝土防腐涂层体系,针对性的提出了施工技术要求和质量控制要求,取得了较好的施工效果；通过混凝土防腐涂层的设计与施工基本解决了单纯以提高混凝土密实性为主的设计思路,在延长混凝土桥梁的使用寿命,减少检查养护的工作量及对桥梁构件的维修费用方面做出了有益的尝试。3、桩基础桩头部位缺少振捣工艺的应用,普遍造成桩头部位混凝土密实性较差,尤其是在涉水桥梁中长时间受水流冲刷等作用,容易造成桩头外露并长期处于干湿循环状态,桩基础钢筋锈蚀造成混凝土胀裂脱落,并进一步加剧钢筋的锈蚀,甚至于主筋锈断的现象时有发生,给桥梁结构的安全造成巨大的隐患。通过对富国大桥加宽新桥桩基础施工工艺的分析研究,提出在水位变动区设置钢护筒,用以保证桩基础混凝土桩头位置免受海水侵蚀,从根本上解决桩头混凝土不密实、脱落引起的钢筋外露锈蚀造成的影响桥梁结构安全的病害。并在富国大桥主河道中重点桩柱进行了防护措施,以验证设置钢护筒对提高了桩柱混凝土的耐久性的影响。综上所述,本文对滨州市省道S315线富国大桥防腐蚀措施的理论性研究和现场施工技术,结合材料特性、经验理论和桥梁结构病害情况,进行综合分析,找出问题的关键,提出较切实可行的解决方案,并组织实施,取得了较好的技术成果和社会效益。通过以上的工程防腐措施的设计与实施,对于滨海地区公路桥梁防腐措施的应用有着十分重要的现实意义。
[Abstract]:in that light of the cause of the corrosion of the pier column of the reinforced concrete bridge in the coastal area and the defect of the self-construction of the pile head, the failure of the concrete is deteriorated, the pile head concrete falls off and the steel bar of the pile foundation is exposed and corroded, so that the durability problem caused by the bridge structure is solved, Based on the crisis bridge reconstruction project of the S315 line of the provincial road of Shandong Province, the research on the anti-corrosion measures of the bridge pile column of the main highway of Binzhou is carried out. The main contents of this study are as follows:1. There is a common problem of the corrosion of Cl-and SO42 ions in the air, water and soil and the premature failure of the concrete due to the erosion of Cl-and SO42 in the air, water and soil. Through the system analysis and research on the cause and mechanism of the deterioration of the reinforced concrete bridge, the concrete raw material, the water-reducing agent and the high-efficiency water reducing agent are strictly controlled on the basis of the analysis of the structural components of various concrete raw materials, water reducing agent and active admixture, etc. as well as the addition of the active admixture superfine powder, a detailed durability design is carried out on the widening of the new pier column concrete in the rich-country bridge, the compactness of the concrete is improved, and the purpose of prolonging the service life of the concrete is achieved; and 2, the research result of the large-scale coastal bridge has been found in recent years, In the coastal and marine environment, the splash zone and the water level fluctuation zone, due to the splashing and scouring of the waves, the surface is often in a wet state, and the concrete is in a severe environment and is more susceptible to corrosion. Due to the characteristics of the concrete itself, it is impossible to completely avoid the micro-pores of the surface and the cracks due to shrinkage and deformation, even stress, which can bring hidden trouble to the durability of the concrete. It is difficult to guarantee the durability of the concrete structure in the corrosive environment. By analyzing the material composition of the common concrete anti-corrosion coating and comparing the advantages and disadvantages of the materials, the design combination of the epoxy sealing primer and the epoxy intermediate paint and the acrylic polyurethane finish paint anti-corrosion system is put forward, and the concrete anti-corrosion coating system suitable for the rich country bridge is designed, According to the design and construction of the concrete anti-corrosion coating, the design idea of simply improving the compactness of the concrete is solved, and the service life of the concrete bridge is prolonged, The invention has the beneficial effects of reducing the work load of the inspection and curing and the maintenance cost of the bridge member. It is easy to cause the pile head to be exposed and is in a dry and wet circulation state for a long time, the corrosion of the steel bar of the pile foundation causes the concrete to expand and fall off, and the corrosion of the steel bar is further increased, and even the phenomenon that the main rib rust is broken often happens, and the safety of the bridge structure is caused by a great hidden danger. Through the analysis and research on the construction technology of the new bridge pile foundation of the rich-country bridge, the steel casing is set up in the water level fluctuation area to ensure that the pile foundation concrete pile head position is protected from the sea water attack, and the pile head concrete is fundamentally solved, And the bridge structure is safe to be affected by the exposed corrosion of the steel bar caused by the shedding. The protective measures are carried out in the main channel of the main channel of the rich-country bridge to verify the effect of setting the steel casing on the improvement of the durability of the pile-column concrete. In conclusion, this paper makes a comprehensive analysis on the theoretical research and field construction technology of the anti-corrosion measures of the S315 line rich-country bridge in Binzhou City, in combination with the material characteristics, the experience theory and the bridge structural diseases, and makes a comprehensive analysis to find out the key of the problem and put forward a more practical solution. And the implementation is organized, and the better technical result and the social benefit are obtained. Through the design and implementation of the above-mentioned engineering anti-corrosion measures, it is of great practical significance to the application of anti-corrosion measures for highway bridges in the coastal area.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.73
本文编号：2500428
[Abstract]:in that light of the cause of the corrosion of the pier column of the reinforced concrete bridge in the coastal area and the defect of the self-construction of the pile head, the failure of the concrete is deteriorated, the pile head concrete falls off and the steel bar of the pile foundation is exposed and corroded, so that the durability problem caused by the bridge structure is solved, Based on the crisis bridge reconstruction project of the S315 line of the provincial road of Shandong Province, the research on the anti-corrosion measures of the bridge pile column of the main highway of Binzhou is carried out. The main contents of this study are as follows:1. There is a common problem of the corrosion of Cl-and SO42 ions in the air, water and soil and the premature failure of the concrete due to the erosion of Cl-and SO42 in the air, water and soil. Through the system analysis and research on the cause and mechanism of the deterioration of the reinforced concrete bridge, the concrete raw material, the water-reducing agent and the high-efficiency water reducing agent are strictly controlled on the basis of the analysis of the structural components of various concrete raw materials, water reducing agent and active admixture, etc. as well as the addition of the active admixture superfine powder, a detailed durability design is carried out on the widening of the new pier column concrete in the rich-country bridge, the compactness of the concrete is improved, and the purpose of prolonging the service life of the concrete is achieved; and 2, the research result of the large-scale coastal bridge has been found in recent years, In the coastal and marine environment, the splash zone and the water level fluctuation zone, due to the splashing and scouring of the waves, the surface is often in a wet state, and the concrete is in a severe environment and is more susceptible to corrosion. Due to the characteristics of the concrete itself, it is impossible to completely avoid the micro-pores of the surface and the cracks due to shrinkage and deformation, even stress, which can bring hidden trouble to the durability of the concrete. It is difficult to guarantee the durability of the concrete structure in the corrosive environment. By analyzing the material composition of the common concrete anti-corrosion coating and comparing the advantages and disadvantages of the materials, the design combination of the epoxy sealing primer and the epoxy intermediate paint and the acrylic polyurethane finish paint anti-corrosion system is put forward, and the concrete anti-corrosion coating system suitable for the rich country bridge is designed, According to the design and construction of the concrete anti-corrosion coating, the design idea of simply improving the compactness of the concrete is solved, and the service life of the concrete bridge is prolonged, The invention has the beneficial effects of reducing the work load of the inspection and curing and the maintenance cost of the bridge member. It is easy to cause the pile head to be exposed and is in a dry and wet circulation state for a long time, the corrosion of the steel bar of the pile foundation causes the concrete to expand and fall off, and the corrosion of the steel bar is further increased, and even the phenomenon that the main rib rust is broken often happens, and the safety of the bridge structure is caused by a great hidden danger. Through the analysis and research on the construction technology of the new bridge pile foundation of the rich-country bridge, the steel casing is set up in the water level fluctuation area to ensure that the pile foundation concrete pile head position is protected from the sea water attack, and the pile head concrete is fundamentally solved, And the bridge structure is safe to be affected by the exposed corrosion of the steel bar caused by the shedding. The protective measures are carried out in the main channel of the main channel of the rich-country bridge to verify the effect of setting the steel casing on the improvement of the durability of the pile-column concrete. In conclusion, this paper makes a comprehensive analysis on the theoretical research and field construction technology of the anti-corrosion measures of the S315 line rich-country bridge in Binzhou City, in combination with the material characteristics, the experience theory and the bridge structural diseases, and makes a comprehensive analysis to find out the key of the problem and put forward a more practical solution. And the implementation is organized, and the better technical result and the social benefit are obtained. Through the design and implementation of the above-mentioned engineering anti-corrosion measures, it is of great practical significance to the application of anti-corrosion measures for highway bridges in the coastal area.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.73
【二级参考文献】
相关期刊论文 前3条
1 丁自强;海工混凝土结构的防腐蚀[J];华北水利水电学院学报;2000年01期
2 孙家瑛,吴初航,周承功,杨华祖;钢筋混凝土桥梁耐久性调查及防治措施研究[J];混凝土;2003年03期
3 袁迎曙,贾福萍,蔡跃;锈蚀钢筋混凝土梁的结构性能退化模型[J];土木工程学报;2001年03期
，本文编号：2500428
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2500428.html
